Harman Kardon HK690 - Alignment Procedures

ALIGNMENT PROCEDURES
=
AMPLIFIER
SECTION
3.
@
DC
balance
and
idling
adjustments
4
Conditions:
«Set
the
function
switch
to
aux/DAD.
Set the volume to minimum.
Set the speaker system switches 1 and 2 to OFF.
Make
sure
that
primary
supply
voltage
comes
within
120
V
+
2V.
Make the adjustment at a room temperature of 25°C.
a Correct valu
Connect
the
digital
voltmeter
between
TP1
and
VR401
+
bc
betance
|_sround.
(L
channel)
Qetony
adjustment
Connect
the
digital
voltmeter
between
TP2
and
VR402
0+10mV
ground. (R channel)
ats VR403
Taig
Connect
the
digital
voltmeter
to
TP3
and
TP4.
(L
channel)
30mV
adjustment
igi
VR404
Connect
the
digital
voltmeter
to
TP5
and
TP6.
(R
channel)
30mV
(
Repeat
steps
1
through
4
after
aging
for
10
minutes.
«= TUNER SECTION
1. STANDARD FREQUENCY CHECK
Condition: « Set the function switch to FM.
Nee
Measurement
|
Station
|
Adjustment
ae
rae
Step
;
Tiegueey
|
dliplay.
|[--
lesation
|
ulustomnt
madiod
,
si
|
°
Connect
the
Livia
am
i
98.3
MHz
1OOMHz
+
2kHz
2. AM ALIGNMENT
Conditions: ¢ Set the function switch to AM.
Set the muting switch to off (=).
Item
leement
Suen
Aiea
|
_
Adjustment
method
(
bee
frequency|
2
z
fuaing
‘s
Gonriect
the
OC
volimieker
tO.
520kHz
|
L252
1.5V
+
0.05V
adjustment
|
P14
(+)
and
ground
(-).
1710kHz
|
TC252
23V
+0.5V
[
«
Radiate
output
of
AM
signal
generator
(400Hz
30%
modula-
i
Woiustment
|
_
tion)
to
AM
loop
antenna,
450kHz|
1600KH2
|
728)
|
Alesse
arrose
and
Connect
oscilloscope
to
TPS
(+)
ggg
wexe
rom
and
ground
(—).
¢
Radiate
output
of
AM
signal
4
generator
(400Hz
30%
modula.
|
600kHz|
600kHz
|
L251
Tracking
tion)
to
AM
loop
antenna,
Maximize
the
output
adjustment
|
*
Connect
oscilloscope
and
AC
level.
voltmeter
to
TAPE
1
OUT
termi-
|1400kHz|
1400kHz
|
C251
nals.
Repeat
steps
4
and
5.
‘v
pruned
«
Radiate
output
of
AM
signal
gener-
Confirm
the
tuned
indi-
aifates.
|
ator
(400Hz
30%
modulation)
to
|1000kHz|
1000kHz
cator
lights
at
60
dB
tion
AM
loop
antenna.
_|
input.
Mi}